Equivalent strain imparting device and its control method

摘要

PROBLEM TO BE SOLVED: To increase the possibility of use of an equivalent strain imparting technique for an industrial field by introducing substantially uniform equivalent strain into the whole workpiece, enhancing process precision associated with imparting of the equivalent strain, and accelerating automation.SOLUTION: An equivalent strain imparting device is configured: to gradually increase pressure applied to a workpiece through a first metal mold and a second metal mold of first pressure application means toward target pressure while putting the first metal mold closer to the second metal mold at a gradually decreasing speed; to make second pressure application means start applying pressure after the applied pressure of the first pressure application means reaches the target pressure; to maintain the pressure applied by the first pressure application means at the target pressure while the second metal mold slides; and to remove the pressure applied by the first pressure application means after the second metal mold finishes sliding and then to separate and return the first metal mold from the second metal mold to its initial position while gradually reducing the speed of the first metal mold relative to the second metal mold.